Google: Gemini 3.1 Pro Preview Custom Tools

Gemini

Multimodal

Paid

Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party or user-defined functions are available. This specialized preview endpoint significantly increases function calling reliability and ensures the model selects the most appropriate tool in coding agents and complex, multi-tool workflows. It retains the core strengths of Gemini 3.1 Pro, including multimodal reasoning across text, image, video, audio, and code, a 1M-token context window, and strong software engineering performance.

Parameters

Context Window

1,048,576

tokens

Input Price

per 1M tokens

Output Price

$12

per 1M tokens

Capabilities

Model capabilities and supported modalities

Performance

Reasoning

Excellent reasoning capabilities with strong logical analysis

Math

Capable of solving most mathematical problems accurately

Coding

Specialized in code generation with excellent programming capabilities

Knowledge

Extensive knowledge base with broad coverage of topics

Modalities

Input Modalities

text,audio,image,video,file

Output Modalities

text

LLM Price Calculator

Calculate the cost of using this model

Input Tokens (0.00000200/token)$0.003000

Output Tokens (0.00001200/token)$0.036000

Common Scenarios:

Input Cost:$0.003000

Output Cost:$0.036000

Total Cost:$0.039000

Estimated usage: 4,500 tokens

Monthly Cost Estimator

Based on different usage levels

Light Usage

$0.1400

~10 requests

Moderate Usage

$1.4000

~100 requests

Heavy Usage

$14.0000

~1000 requests

Enterprise

$140.0000

~10,000 requests

Note: Estimates based on current token count settings per request.

Last Updated: 2026/04/01